The freezing points and vapour pressures of solutions of sugar are also in conformity with the theoretical numbers.
The measurements of freezing points of solutions at the extreme dilution necessary to secure complete ionization is a matter of great difficulty, and has been overcome only in a research initiated by E.
It is found that divergence has begun before the concentration has become great enough to enable freezing points to be measured with any ordinary apparatus.
It should be pointed out that no measurements on osmotic pressures or freezing points can do more than tell us that an excess of particles is present; such experiments can throw no light on the question whether or not those particles are electrically charged.
If we determine the freezing-points of a number of mixtures varying in composition from pure A to pure B, we can plot the freezing-point curve.